Among which one of the following sets of social/religious groups is the extent of poverty the highest, as per Government statistics for the nineties

(a)

Muslims in Kerala, Gujarat and A.P.

(b)

Tribals in Bihar, Orissa, M.P. and Maharashtra

(c)

Scheduled Castes in Punjab, Western UP, northern Rajasthan and Tamil Nadu

(d)

Christians in Gujarat, Maharashtra and Assam